wyUpdate.exe update itself...

I know wyUpdate.exe will update itself but what I don't know is, how often it checks for updates.

Also, is the wyUpdate.exe the same for every update project? Like, can I use wyUpdate.exe in projectB even though it was generated with the update build from projectA?

I know wyUpdate.exe will update itself but what I don't know is, how often it checks for updates.

Everytime there's an update to your app.

Also, is the wyUpdate.exe the same for every update project? Like, can I use wyUpdate.exe in projectB even though it was generated with the update build from projectA?

The wyUpdate.exe? Yes. The client.wyc? No.